aI..$¡L

fftE'

ff:i:;f

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ri;':i..

¡ltr:. ,

:ì.;i"iÍ'';

':i

irt:

T{AIER IIWESITGATIOIIS BRA}ICIIBRITISH COLNßIA I{ATER RESOURCES SERYICE

DEPARnTENT OF IANDS, F0RES18 Al,lD I{ATER RSSOURCES. PARLIAMEM BUILDI,NGSVIGIORIA, BRITISU CoLUIíBIA

R. A. W1llfams. Minlsler

'-tt*

\T{ATER II.IT¡ESTTGATI q{S BRAI{CBB. B. Harr. Ghtef Enefneer

D, E. Reksten, P.Eng.Eydraulfc Englneer

^b

IIATER RESOI'RCES SERVTCEV. Raudseop. DeouÈv Mfnlster'

Flle: 02425L2-36Date: Septeober, L972

MISSION CREEK I,üATER NELD

BI.ACK MOT'¡¡TAIN IRRIGATION DISTRTqT

FOR

)

SYNOPSIS

Black ldountaln Irrlgatlon DlsÈrfct derfves lÈs htater st¡pply f¡ø

Ml.sslon Creek uear Kelowna, BrlÈlsh Cohnbfa. I{aÈer fs stored ln Gray-

stoke, Flsh lt¡alft änd Belgo reservofrs fn the headwaters of the basLn-

A1Èhough Graystoke resen¡ofr was purposely breacUà¿ fn early L972 Ln a¡-

tlcfpation of hfgh freshet.flows, lt ls assrmed for thls study thaÈ Lt

ls operatlonal as lt wlll be replaced ln the near future.

Estloates of monthly runoff are ¡iade for a mean year and three

droughC years, L929, 1930 and.1931, using r¡arfous esÈfmatlng methods'

a .or$^t."!zed accounËlng procedure makes storage calculatf,ons-N

for a seguence of a mean runoff year followed by the three drougbÈ years

assr.ulng varl.ous storage capacltl.es and denand estlÍates'

To satlsfy the deslgn deæand of 181700 acre-feet for three coo-

secutlve drought yeårs slmllar to that ¡¡hich occurred I¡ L929-31, Gray-

stoke reserrroir capaclËy must be 41000 acre-feet (capacity befo¡e breach-

ing was 21100 acre-feet) with Ftsh Har¡k and Belgo rese:r¡oirs røtalnlng aÈ

thelr exfsulng capacftles of 1r700 acre-feet and 51470 acre-feeË resPec-

tLvely. Itilda .diversf.on Èo Belgo reservoir must be operated conclnuously

during a rûean or lor¡er runoff year.

Pa¡e

I

I3

2.

3.

35667I

BASIC INFORUATION .. ¡ ¡ ¡ ¡¡r ........ ... o......... r...............

IIEAN AIINUAL ¡¡ATIJRAL RITNOFF . . . Ò. . . o . . . . . . . . . . . . . . . . o . . . . . . . . . .

3.1 Stregnflolt Date . ... ........ . ........ .. . :........ .... ....3 rZ Grtd Square Ugthod . o..... . o. .. o o.. .... ... .... ......... o.3.3 U.B.C. Average Flog Estlm¡tes ..................o...r...!3 .4 Læbly Creek Runoff -Elevatlon Relatlonshfp . .. . . . .. .. . .. .3.5 Dlscr¡ssloo o o o........... o o o.... t. ..... o......... o... o. t.3.6 $nrrna¡y . a a...... o . a. a.o.. a o . a. a. a....a... o a a. a. o.. a aaa a o

UEA¡¡ UONTBLY ¡tAlXtBAt RTNOFF . . . o . . . ..n. . . o . . . . . . . . . . . o. . . . . .. . .

uLNIUttlf aNNI¡aL IIAIIJRAL Rt NOFT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.

5.

9

9

12

t2

l3

6.

7.

5.1 Stre¿nflow Data ...or..o..o......r..o.................... 95.2 Okanagan Lakg Inflow Date .........o..................... 105.3 U.B.C. Minlnu¡n Flow Estfoatgs ...o....................... 115.4 Srrmary .......... ..............o ................o..oa..o lf

MINIUT¡U MOt'¡THLY NAruRAL RIrNOff . . . . . . . . . . . . . . . r.. . . .. . . . . . . . . r

RESERVOIR NBT INFTCH .. . . . . r. . .. . . . .. . . r . . . . . . . ........ .......

8. DEUAITD ..... .......... o........ e.... a a......... ........o... o..

9. ST0RAGE CALCTTLATIONS . .... .. . . . . . r. . . ...... ... . ... . . . . ....... . 14

10. CCIfCtUSIo[fS ... .........................o.o.. ...........r..... 16

ll. RECOIÍMENDATIONS ....... o............ o............... o...... o.. 18

APPEI{DICES ... ...........................................}......... 32

REFERENCES .....o................. '.....r.......................... 48

-tL-

LIST OF IABIES

Table

DIEAIÍ M0lfIIlLY RITNOFF DISTRIBIIIION . . o . . . . . o r . o r o r . . . . . .. . . . . ...

Page

20

1.

2.

I9

SIJMMARY OF ESTTUATBS OF MEA}I AIINUAL RI]NOFF a a a aa a a a a a a a a a a a a a a

3. MEAI{ MONffiLY NATIJRAL RIINOFF .. o. . . . . . . . . . . . o o. . . . . . .. . . . . o o. .. 2L

4. SuMltARy 0F ESlrüArES 0F UrNrlftu (1929-31) AÌ{NUáL RUNOFF ...... 22

5. MrNIl4ttM ÌOli¡TnLY RI'NOFF DISItsInnION . ............!........o... 23

6. DROUGIn pB.roD (1929-3L) l{oñffitY N¿TIJRAL RI'NOFF .............. 24

7. UEAI'¡ MONIITLY LAKE E\¡APORAIION .... o....... ... o...r....... ..... 25

8. MEAIT¡ UObIlfIILT NET INTIOI'Í .. . . .. . . . . ... . .. . r .. .. .. . . . .. . . . .. . . .. 26

9. DRoUGHT pm,roD (1929-31) Ì4oNfHLY NEf, rNFIrol{.o.o.o............ 27

-111-

)

LISÎ OE rtrGt RES

Flcurc Page

l. LOCAÎION UAP OF MISSION|CREEK DRALIIAGE BASIN ."r" "" """' 28

2. PLAI{ OF MISSIoN CREEKWATERSHED .........'...' """""'o""' 29./

3. fgif ærr¡f¡e¡, UNIT RUNOFF . . . . .. . . . . . . . . . o . . .. . . . ..'' .. "'' o o ¡ ô ¡ 30

4. ESÎIUAIED UEAI{ al{Nual, ITNIT RtNoFr ..o..o..?..c."""" ..""' 31

t. -lv-

)

)

UISSION CREEK I.TATER YIELD. FOR

BI.acK uotnita¡n rRRrcarroN DrsrRLGt

1. rllERODUGrroN

Black Uountain lrrlgatlon.DlstrlcÈ. supplles r¡eter to soBe 4t900=-\-._

acreE of land and sfo doroestlc connectÍons neer Kelolnra, Brftfsb coluobla

(Ffgures 1 and 2). ìil¿ DisËrlct oPelates storage rese¡nroirs on Belgo

(tdeal) Lake, GraysÈoke Lake and Ffsh Bank Lake' Rehabflftatfon of the

Dlst¡ictrs systen is befng carried out under the aRDA Progra[ne' aÈ the

presenÈ tfme Flsh Hawk resenrofr capacfÈy ls 11700 acre-feet, Belgo re-

sen¡of.r ls 51470 acre-feet.. Graystoke Lake dan r¡as removed fa uay' L972'

buÊ prevlously bad a capaclÈy of 21100 acre-fêet'

ltepurposeoftblsstudylstoprovldeêstlDåtesofavaflable

rater at the Black MounÈain IrrigaÈlon Dlstrlct lntake ln a mean runoff

year and a mlnluum ruaoff year. Tbese data can then be used Ëo esÈlnate

tbe storage regulred to provlde the Dlstrlct sftb uater durfng a droughÈ

perlodsfmflartothatwhlchoccurredinthepcrlodL929-3L.

2. BASIC INFOR}IATI'ON

.ThedrafnageareaconslderedlnthlsstudylstheMlsslonGreek

basfn aborre the Black'uot¡fitafn lrrf getloa Dlstrlct lntake whlch fs loc-

¡ted 0.35 nlle bel0r¡ the mouth of Daves creek' IJlthln this basln are

the three Black uountaln lrrlgatlon DlStrLCt sËorage resenrolr baslns -

Glsystoke, Belgo and Flsb uank. In addltton' Etorage ls derveloped for

I2

Ð

Brenr Davis rrrlgatlpn DisÈricr os Locb Long. fr".$."u stotage fn í

thfs reser:rrofr ls 300 acre-f eet 'I

rhere ere Èqro dfversjons to Belgq Resarnroir whlcb up to tbe pre'

senÈ åtme have been used perlodtcally - uugford creek Dtverslon anó Bllda

Greek Dfverslon. Any ref,erence to Belgo rese¡nrolr basin 1n thfs rePort

lncludes tbe draLnages of these twó dfversloas unless noted othenrlse/

Ttrus,ltlsasstmedthatthesedlverelonsaralargeenougbtobeused

]€at-rormil and can handle aoy f los durlng a s¡ean runof f yeat '

area and medfan elevatloa for the baslns Pertlnent to

ltsted below.

Dralnage

thls rePort are

Sub-BaslnDrainage Area

(sq.n1. )Median Blevatlon

(ft. )

Mlsslon Greek ab' BMID fntake

Gïaystoke Reserívoi¡

Ffsh Eawk Reserrrofr

Belgo Reserrrolr

üfssÍon Gr. unregulated basLn

233

6.3

2.L

22.L

202.5

4700

6300

6025

4680

4660

)

ttelrlfssloncreekurrregulaÈedbaslnlsthebaslnabovetheBlack

MotmtglnlrrlgaÈfonDlstrfctlntakeercludlngthetbreeBlackuounÈafn

IrrlgatlonDlsÈrfctresen'olrbaslns.Inthlsreportthlsvlllslrnply

becalledthe''unregulatedbasln|'.Itshouldbe¡otedthaÈthellunregu.

latedbasln||locludesLochLongreseflolrbasin.Itsdratn¡gearcals

onlyl.5sqrrarenflesandforstnpllcttylsnoÈsubtractedfromtheun.

ragulated basin dralnage 8tê8'

3

3.Iüeanannt¡¿lnaturalnrnofflsesÈfnatedbyfourmetbods.Qualt-

:

fyfng remarks regardfng each'ueÈhod are ¡nade fn sectt'on 3'5'

daÈa were obtafned 1n 19713.1 Streamflsw Dåta,

oo sfx

In the üfsslon Greek basln' 5f,'¡g¡mft6r¡r

sub-basins as follows'

Sub-BasfaHedfan

E1ev.(ft. )

Arca

(sg.ml. )

1971 Aprll-JulY Runoffs

(ac.-ft.) (ac.-fÈ./sq.ml.)

GlaYstoke Reserrroir*

PooleY Greek

Pcarson Greek

ttllda Creek

Belgo Reservofrt(tnãtuatng üugfordDlv. onlY)

Davos Creek 4260 13.55 21780

6300

5700

5120

5090

4530

6.3

6,4

28.82

7

15.1

11,130

8r050

23 rtßg

3 r27O

61640

L770

1260

815

467

430

205

)

*L¿ked'aPoratlonandpreclpltatlonb¡sedonAmspherlcEmrl.roment

senf ce date accounted for to gl.ve naÈural sub-basÍn runoff '

**AssæeofthesedstadldnotcoverthefullAprllltoJuly3lper-

lod,theywereadJuscedÈothefullperlodontbebaslsofPearson

Craek records'

these 1971 Aprll-July dat'a were adJusted to 1971.anlnual runoff

uslogÈberatloofAprft.July/Annualasshgwnlqlablelforvarfouselc.

vatlon zones. (lhis table ls based oa stteuflow data obtalned fn 1971

fro 20 sub-basl'ns 1n the Okanagan Basln')

4

fSub-Basln

Aprll-July

AnnuaI

1971 A¡urual Runoff

(ac. -ft . ) (ac.-f t./sq.of . )

GraysBoke ReseruoÍr

Pootey Creek

Pearson Greek

Bflda Greek

Belgo Rese¡rrolr(lncludfng UugfordDiv. only)

Daves Creek

.96

.95

.93

.93

.88

.88

11,730

8r570

25,27O

31520

7,380

3,190

1860

1340

877

502

/ 498

235

the 1971 annual unit runoff data (ac'-ft'/sq'raf ')

agal.nst elevatlon fn Flgure.3. Uslng the best llne drawn

the data pofnts, the followlng estlnates are rade for tbe

tlnent to thle studY.

are plotted

by eye through

sub-baslns per-

Sub-BaslnMedlao

Elev.(fr. )

Area

(sq.nf . )

Estl-naÈed 1971 Annual Runoff

(ac.-fÈ. ) (ac.-ft./sq.mi.)

)

Gìraystoke

. Fish trawk

Belgo

Unregulated basfn

6300

6025

4680

4660

6.3

2.L

22.L

202.5

L2,2OO

3 1260

9,940

88 r 200

1940

1550

450

435

J

1o convert 1971 annual runoff to uean

three nearby basins wfth ffve years (1967-7t)

deta are used, lbese data for Terrace Creek,

annual runoff, data for

of rellable naÈural runoff

Esperon Creek and for Joe

I5

Rlcb creek lndlcate th8È 1971 runoff was 26% above the 19ó7-71 mean'

In addttlon, Otcanagan Lake natural trfbutery lnflow (net hlstorfc fnflow

plus consumptlve use plus 1aÈe evaporåtLon minus lake precfpltatloa)

data compfled for the 1921-71 perfod |n rrOkanagan,Basin Inflow Determin-

atlonsfrrl.A.J.LeachrsepceoberrLgTOrindtcatethattheL96T-7L8¡ean

ts 9TL of the long-Èer-m L92L-7L l[e?û. thus, 1971 runoff ts 25% above

the 1921-71 mean. lbls departure froo average ls used to adJust 1971

annual runoff to a mean annual rynoff'

Sub-BaslaMean aanual Runoff U#

Gra¡rstoke

Flsh Hawk

Belgo

Unregulated basÍn

29.L

23.2

6.75

6.53

1550

L240

3ó0

348

9 1760

21600

7 1960

70r500

3.2 Grld Souare Method

Gìrld Square data end

1n rrAppllcatloû of the Grld

Basln Runofftr, H. Obedkofft

on thts nethod ls:

the appltcatloo of thls method are descrlbed

Square Method for Est{mating Okanagan Sub-

Deceober, LglL. the mean anaual runoff based

)

Sub-BaslnMean Annual Runoff

(1n. ) (ac.-f t. /sq.ni. ) (ac.-tt ',

)

Graystoke

Flsh H.e!ùk

Belgo

Unregulated basfn

23.9

22,8

ll.212.4

L270

12t0

597

661

8,030

2r55O

13,200

134,000

3.3 U.B.G. Average Flo¡r Estlmates

usfng the runoff-elevatlon relatfonshlp derfved ln tbe

Basln Study Report ltAverage b¡ows 1n tha llain Trlbutary Baslnstl

anuual runoff ylelds the followfng resuljs'

0kanagan

for mean

Sub-Basfnlfean Annual Runoff

;¡ (ac'-ft ' )

Graystoke

Ffsh Eawk

Belgo

Unregulated basln

19.ó

18.1

8.14

I .6r

1040

964

434

458

6r580

21020

9r590

92r9OO

3.4

Estloates of mean Aprtl-July runoff for the Lanbly creek basfn

c¡n be transferred to the l{lsslon creek basln whlch 1s at the same latl-

tude but on the opposlte slde of Okaaagan Valley. Uslng the Lambly Creek

runoff-elevatÍon curíve derfved ln rrl,ambly Creek llåter Yieldrrr D. E. Rekst,en,

Deceober, 1970, mean April-July runoff ls estlnated, then adJusted as Ín

SecÈlon 3.1 to estLnate meån annuel n¡ooff'

Mean Annual Runoff -(ac.-ft. )Sub-Basfn

)Graystoke

Flsh Eawk

Belgo

Uaregulated basin

2L.3

19.5

9.3

9.4

1140

1040

497

501

7,150

2,180

11,0oo

101,400

-)3.5 Discussfon

Ihese estfû¡ates sr4âr(ze6 below and

by the coments followlng. I .

Ln Table 2 nay be qtrallffed

Sub-BaslnUethod Unregulated

BasfnGtaystoke Ffsh Bawk Belgoln. and 8c.-ft.

I Strear"flow Data

2 Crfd Square

3 U.B.C Average

4 Lanbly Graek

Mean 1n.

üean ac.-fÈ.

29.L

9 1760

23.9

8r030

19.6

6r580

2L.3

7r150

23.5

7 1890

23.2

21600

22.8

2r55O

18.1

2rO2O

19.5

2,180

20.9

2r34O

6.9

7,960

LL.2

13,200

8.1

9r590

9.3

11,0oo

8.8

10r4oo

6.5

70r5oo

L2.4

134,000

8.6

92r90O

9.4

101 r400

9.2

9?,3oo tl9 t.7o

)

J

üethod I (Streanflor Data) fUs estfnåte depends on the relfabfllty of

asstrmlng thåÈ 1971 runoff ln tbe lflssfon Greek basfn Ls 257

above average.

Èfethod 2 (Grld Square) the accuracy of Èhese grld square estfDaÈes de-

pends on the ntnber of squares facluded tn Èhe sub-basln. Slx

' fs consldered deslrable. One square ls lncluded 1n tbe Gray-

eÈoke and Ffsh Hawk estimate, two tn the Belgo esÈlnate and 37

ln Èhe estfmåÈê for the unregulated baEfn. It rould be ex-

pected thåt the e6ÈfnåÈe for the unregulaÈed basln fs mcre

accurate Èhan those for the strsl1er sub-baslns'

I8

(U.B.C. Average Runoff) lbe runoff-elevatlon relaÈfonsbfp de-

rived by the Universtty of Br1Èlsh Colunbla 1s believed by tbeo

to tttmderestlnateithe contributlon froo the hlgh areas aad ovêf-

estíDete the contrlbutfon frm tbe low.areasrr, thus errfng on

tbe conse¡ivatlve slde for lrrfgatfon studles.

(UnUfy.Greek Runoff) Althougb these estLnåtes are based on a

ruaoff-elevatlon relatlonshlp for taobly Creek, a nearby basÍn,

ft fs ãt tbe sàine laÈltude and should ag¡ee fafrly well with

tbat for lflssLon Greek.

Uethod 3

Hethod 4

3.6 St¡rmarv

In strølary, tt fs fe1t, Èbet tbe average of tbe four esÈl.mâtes

for eacb sub-basfn as tabulated below is tbe most rell.able.

Sub-BasfnMean Annual Runoff

Graystoke

Flsh Eat¡k

Belgo

Unregulated basl.n

23.5

20,9

8.8

9.2

L250

1110

470

490

7r890

2,34O

10r400

9,9r3oo

)

)

These average flgures fn ac.'f't.1s9,.m1. are plotted

an basl.n elevatlon !n Flgure 4. '1o deflne Èhe curye {n the

feet range, mean annual runoff for Pooley Creek and Pearson

tfnated uslng the same four methods.

ôr(-. lì) ¿\-tv

agafnst nedf-

5000 to 6000

Creek ¡¡ae ês-

9

Althougb ttrere åre aore large dlfferences Ín estlnåtes for each

sub-basl.n, the snall deviatfons of the slx pol'nts fron the cufle ln Flg-

ure 4 lndfcates that the avérage.of Èhe four uethods should be a relfable

estlûate of mean annual rtmoff.

As a Detter, of 1nÈerest, fn a rePort

stoke Lakert, June 9, 1970r f11e 0256957r !{r.

Lake mean annual runoff as 20.8 fnches based

tfon estlnates for the basfn. ThÍs comPares

thfs study.

ItMean Aonual Runoff to GraY'

Coulson estfnated GraYstoke

on preclpltatlon and erraPora-

sell wlth esÈftråtes nade ln

)

4. UEAT{ UONflILY I.IAI1'RAL RTJNOFF

Rellable streamflow data for 1971 are available f.or 22 selected

basins !n the Okanagan Basln. lbese data were used to deflne the varla-

tfo.n of the monthly ruaoff Pêttern wlth elevetlon as sbo¡rn prevlously

ln Table 1. Althougb 1971 runoff fs above averager the 1971 nonÈbly dls-

trlbutf.on fs assr.oed to be rePlesentatfve of the dfstrlbutlon Ln a mesn

runoff year. ftfs distrlbutlon fs used Èo estlmete ureen nonthly runoff

for each sub-basLn 1n thls sËudy. For sünpllcity, the dfstrlbutlon used

ls the onê for tbe 500-foot elevation band closest to the medl'an sub-

basin elevatlon. Meen monthly runoff ls tabulated fn Table 3'

5. UTNIMI'M AI{NUAL NATT'RAL RTJNOFF

5.1 Streaoflow DaÈa

Flve years of natural streamflow data fron 1967 to 1971 on DEves

)

-)10

Gteek and Joe Rl.cb Creek (trfbutarles to Mfsslon Creek) lndlcate that

f,or L97O, a very 1ow runoff year, the deperÈure from the five-)¡eer nean

Is -5&. As descrfbed fn Sectlon 3.1, thfs ls equlvalent to -48% fron

the 192t -71 meaa based on long-ter,m naturel trlbutary tnf low estf.roåtes.

these estfnåtes also lndfcate that runoff fn the three drought years,

L929-L92L, ses +27.; -57. and, -L2'L respecËfvely fron 1970 runoff. If one

assrmes thåt 1970 t7as -48% f¡om tbe long-tetil ueao, then 1929, 1930 and

1931 runoff ts -47%, -51% and -547. f,ton the long-tern Eeån respectLvely.

Applyfng tbese departures Èo the rnean annuål runoff estùutes

f.n Sectloa 3.6 ylelds the followlng L929-3L annual runoff estioates.

Sub-Basfn

Gtaystoke

Flsh Bawk

Belgo

Unregulated basfn

L2.4

11.1

4.7

4,9

11.5

LO.2

4.3

4,5

10.8

9.6

4.0

4.2

)

)

5.2 Okar¡agan Lake Inflow Data

Based on the esÈlnåtes of Okanagan Lake

flow as cæplled by T. A. J. Leach, the percenÈ

Eean for the Èhree olalmtrm runoff years Ls -427,,

-497. Ln 1931. Applylng thêse departures to the

runoff dete¡:Efned tn Sectlon 3.6 results fn the

runoff esÈfo¿tes.

natural trfbutary ln-

departure from Èhe L92L-7L

L¡ L929, -457. fn 1930 and

estfmated mean an¡rual

following 1929-3L annuel

1t

Sub-Basln 4lnfmnn Annual Runoff (1n.)L929 1930 1931

Graystoke

Flsh trawk

Belgo

Umegulated basin

13 .6

L2.L

. 5.1

5.3

L2.9

11.5

4.8

5.1

L2.O

10.7

4.5

4.7

5.3 U.B.C. Illnfmum Flow Estltrates

In a report entltled I'Flows fn the Maln lrlbutåry Baslnsrt, the

Unlverslty of British Golt¡mbia derfved a runoff-elevatlon relatfonsblp

for 1970 fn Èhe Ocanagan Basln. In thls report fÈ fs estfnåted tbat

1929, 1930 and 1931 are 98"L, 94% and Bf/. respectlvely of 1970 runoff.

Uslng these data, the followfng est{mates are obtained.

Sub-BaslnMfnlmr¡m Annual Runoff (fn. )

L929 1930 1931

Graystoke

Flsh Hawk

Belgo

Unregulated basfn

L5,2

13.ó

4.L

5.8

L4.6

13 .1

4.0

5.5

L2.4

11.1

3.4

4.7

-)

1n

be)

5.4 Sr¡marv

the nfnf¡nun runoff estfrates by the three roeÈhods are surnatlzed

Table 4. The average of the tbree estimåtes as tabulated below sfll

used as the runoff estlnates for L929, 1930 and 1931.

L2

Sub-Basin

Graystoke 13.7

Flsh Hawk L2,3

Belgo 4.6

Unregulated 5.3basln

13.0 LL.7

11.6 10.5

4.4 4.0

5,0 4.5

693 623

618 560

234 2L3

266 240

730

656

245

282

'41600

1,380

5r410

52,100

4r37O

1,300

5r170

5¿,qoo

3 1920

1r180

4r7LO

4q,qoo

)

)

tg4ffi L+14o 58 4 to

6. I'fINIMT'}.Í MONT'I{LY NAIT'RAL RT'NOFF

Based on 1970 streamflow data, I table s{r¡llar to lable 1 bas

been derlved for the aonÈhly distrlbutfon of annual flow during a ninf-

mrn runoff year, Usl-ng the data shorrr¡ in Table 5, nonthly florrs for

eact drought year and each sub-basin are tabulaÈed in Table ó. It fs

asstoed that thls 1970 nonthly dtstrfbutlon ts valid for all drought

years as 1970 was a very low runoff year.

7. RESERVOIR NET INFLOI.I

The nonthly natural runoff estfmates for the resen¡olr basfns

tabulated 1o Tables 3 and ó do not account for lake evaporatl.on, although

they lndirectly lnclude the effect of evapotrenspfraÈfon over tbe r¿hole

basfn. the estluates fn Table 3 and 6 are adJusÈed for lake evaporatlon

to yleld resen¡ofr net lnflor estimates as sborun 1n lable I and 9. The

evaporatlon estiEates are obtafned fron grld Equare data supplled by

I13

the Atmospherlc EnvÍro¡¡nenÈ Service, Department of the Enviror¡ment. lfean

monthly lake evaporaÈlon data as tabulated ln Table 7 are used for ¡uean

and mÍnfmr:m n¡noff years. ïhe lake surface area !ùEts asst¡¡ed to be that

at the spfllway elevatl.on.

It should be noÈed ÈhaË Èhe Atmospherlc F¡rvlroûtrenÈ Service data

show signfflcant evaporatiòn fn Apfll and lfay ¡¿hen Èhere l¡ould likely be

no evaPotatlon due Ëo Lce cover, especLally GraysÈoke and Fish Har¡k. To

be on the conservat,íve side in calculatirig net {nflow, the i{tmospherlc

Envfrorm,enÈ ServÍce daEa for Èhese two months is used.

8. DEMAND

. Deoqand figures are supplted by the waËer suppry and rnvestlga-

tÍons Division on Ëhe basis of irrÍgaÈion duty requÍrements esËablished

by the DeparËment of A,griculÈure and domestic requir€ments of 0.75 acte-

fooc/year.

The total demand for Black Mountafn Irrlgacion DistricÈ, includ-

tng 5% pipe losses and slltÍng basfn evaporatíon aÈ the intake, is 141409

acre-feet dfstributed as follo¡¡s i 1Lnb6 AN4 ' loro t'*^ '

Irrfgatlon DomesËlc Total

October-MarchAprflìCayJuneJulyAugusÈSeptober

Annual

00'

191 191t54

)

IL4

In addlÈlon Èo thfs demand, therr

of the B1ack MountaÍn lrrlgatlon DlsÈrict

Based on infomaËfon supplf"ed by the Dlsr

1), Èhls lrrigaÈion requÍrement must be added to the Black Mountafn lrrl-gaÈlon DlsÈricÈ demand.

Dohrnst,ream lotaIBlack MounÈalnfriigation. Dlstrict

October-ìÍarch 191 '0 191April 54 0/ 54lhy. 2,525 0 Z,S2SJune 3 1253 11059 4r3lzJuly 3,692 Ir094 4,796August 31533 Ir095 4r6\aSeptaber 1.161 1,059 2.220,

Ai¡nual L4r¿û9 41307 : 18, 716 acre-f eeÈ

thfs annual denand of 18r716 acre-feet wÍl1 be used for calculatlng

storage conditions for Black ¡fountaín IrrigaËion DfstricË reservol.rs.

9. STORAGE CAICULATIONS

Tbe estÍmates of runoff provlded Ín Tables 3, 6, 8 and 9 are

used to calculaËe monÈh-end storage asswfng varfous reservofr capacl.tÍes,

and operation procedures.

Based on the model of the basfn above the B1ack }lounÊain lrrlga-tions DfsËrfcÈ intake descrlbed tn Appendlx 2, a compuEer progranfie was

rf,ritten by R. lJynan to calculate toÈal month-end storage. Tbe input data

t¿hlch can be varied ln thls accountÍng of nonthly runoff are reservoir

storage capacfËy, monthly distrÍbutLon of runoff, tran$oisslon loss,

. \ carry-over sËoEage, demand, and the number of years Ín tbe seguence.J

15.l., The operatlon perlod ln thts study ls four years - ê D€Errl runoff

year followed by Ëbree drought Y@rsr L929, 1930 and 1931.

These storage catculattons were made Èo deËermlne the necessary

capaclty of GraysÈoke reservofr whfch was breachefl tn 1971 and ls to be

rebuilt. The capacity previous to breachfng was 21100 acre-feet,

The guldelfnes provlded by Ëhe llater Supply and InvesÊlgaËlons

Divlsfon were as followsi

1. lfaxfnr¡m poËenËÍal capaclty for Graystoke is 61000 acre-feeÈ (mean

annual runoff fs 71890 acre-feet).

2. lfaxfmuo capaciÈy economlcally feastble for GraysÈoke 1s 41000 êcrê-

feet.

CapaclBy of Belgo and Fisb Ha¡¿k reservof.rs to re¡naLn unchanged.

Hilda dl.version to Belgo reservolr not to be used u¡rless necessary

as 1Ê r¡ould requfre rebullding. If used, fts ma¡i¡¡¡o capacity lrould"l.tbe 50 cfs. The naxÍmrn recorded flow fn L97L, an above-average run-

off year, r¡as 30 cfs. Thus, the assr.rnp¡fe¡ made aË Ëhe comôencaenÈ

of thÍs sÈudy that HÍlda diverslon can handle any flow in a drought

or mean runoff year ls conffrmed.

Based on these guidellnes,

followtng condftfons:

Èwo compuÈer ru¡rs çs¡g made under tbe

Run 1 6r000 acre-feeÈ

used.

41000 acre-feeÈ,

contlnuous use.

3.

4.

Graystoke capaclty

IIÍlda diversion not

Graystoke capaclËy

HÍlda diverslon in)

Run 2

-)16

Copfes of the compuËer prfnÈouËs for these trro runs are included

as þpendfx 3.

The resulÈs of Run I lndlcate that all sÈorage would be depleÈed

by August of the Èhlrd droughc year. rn the seco¡d drought year 961

acre-feet would be left ln storage on September 30 to be carrled over to

Ëhe nexÈ year. The'dlstrfbuÈlon of the Èotal carry-eysr sÈorage to Èhe

Ëhree reservol.rs is based natnly on the expected operation of tbe r€s€r-

vof.rs and the dífference beÈween annual inflow and capacfty. An att€ept

fs made Èo dfstrlbute the carry-over sÈorage so that one reservofr f.s

noÈ spilling during the May-June fill period while another is still below

ful1 capacl.ty.

Run 2 with GraysÈoke capaclty of 41000 acre-feet and Hilda dlver-

sfon in oPeraÈÍon all year lndÍcates thac all storage v¡ould be depleted

during September of the thírd drought year. By the end of Septernber the

total deficiency would be 636 acre-feeÈ whÍch fs a relatively small por-

Ël.on of the Sept€mber demand of,21220 aete-feet. In other words, a sltght

ratíonlng of lrater during August and Septenber of the chird drought year

roight be necessary.

10. coNclusIoNs

By reconstrucËfng Graystoke dam to provide 41000 acre-feeÈ of

storage and utllizing the ltflda diversion to mainÈain as much storage

as possible in Belgo reservoÍr, Ëhere should be no shortage of sater forBlack }lountain lrrigation DistricË assr.ming the deslgn daand of lBr716

acre-feet.

L7

I I The mosÈ efficlent operatfon of the three reservofrs appeårs to

be to us'e Graystoke reservoir flrst as 1t can easlly be ftlled due to

the hfgh runoff ln relatlon .to Èhe reservofr capacl.Èy. If the sysË€o

ls operaËed each year on the assumptlon that Ëhe nexÈ wfll be a droughÈ

y€rr the most efflcfenË use of the avallable storage wfll be nade ffon Sqteober 30 Graystoke is empËy, ?læO àcre-feet are in place 1n Belgo

rese¡rrofr and 800 acre-feeË are leit fn Ftsh Hawk reservolr.

The followfng ltens rûusÈ be taken inËo accounË when consfdering

Èhe results of Ëhe storage calculatlonss

l. The criÈerfon that enough storage must be provided Ëo saËl.sfy the

deoand durfng a three-year drought fs based on the fact that three

consecuEive low runoff years r.tere recorded 1n the Okanagan basfn

f,rom L929 to 1931. It, can be reasonably assrned Ëhat Êhe lor¡esÈ

runoff year of 1931 has a return perfod of roughly 50 years based

on Okanagan Lake neË inflow data ¡shlch have been recorded sÍnce L92O.

BuË the reËurn perlod for Èhree consecuËive extremely low n¡noff

years would be much greater.

2. ,Ît¡e amount, of sËorage requlred fs very much dependenc on Èhe August

and September runoff esÈfúaÈes and deoand estLmates. IÈ ls felt that

tbe August, and SepËøber runoff esËÍmates used in this study are

conservative on the low slde.

3. EstlmaËes of lake evaporatfon Ëo compute net lnflo¡r Èo Ëhe rês€E-

voirs are conservatively hÍgh as they are based on the reservofr area

at the spillway elevatíon,

J

.18

11. RECO¡Í}fEI{DATIONS

The streaoflow data.collected at Belgo reservolr and Graystoke

reservol.r duríng 1971 proved most valuable fn thls sÈudy. lltren Graystoke

reservol.r ls bulIt, relnstallfng the sÈreamgaugtng.faclli.tfes should be

glven prime consl.deration. Reltable lnformaÊfon on the amounts dfverted

frm lltlda Creek and Mugford Creels to Belgo reservoir should be collected

so Èhat the estlmaÈes and concluslons r¡ade Ín thls report can be con-

f 1r'med. ;

)

rei

IABIE I UEA}I T.IOITTELY RI'NO¡T DISÎRIBTETG

(Z of January-Decaäber, f97f)

'LmrG oGf.-MAR. apR. uay JLNE JIIty apR.-JIILy aIrG. s'p. apR.-sEp.

> 6500

6000-6500

5500:6000

5000-5500

¿1500-5000

4000-4500

3500-4000

3000-3500

2s00-3000

45337453375.5 52.5 35

8.5 51.5 31

11 50,5 27

12 49.5 23

L2 48.5 19

L2 48 L7

L2 4E L7

11111111111.5 I3 1.5

4242

2

2

3

5

7

9.5

11

11

11

2

2

2

2

2.5

3.5

5

6

6

96

96

95

93

91

88

84.5

83

83

98

98

97

95

93

90.5

89

89

89

20

IABLE 2 ESTIUATES OF UEAII AìTNUAL B¡¡NOTT

(fn. , ac.-ft' )

Sub-Basfnllethod GTaystoke Ftsb nank Betgo "Ï*ll*u

1 Stre¡-rlos Data

2 Gbld Square

3 ü.8.C AveragaRunoff

4 Lanbly Greek

Uean fn.

Uean ac.-ft.

29.L

9 1760

23.9

8r030

19.6

ór580

2L.3

7r150

23.5

7r890

23.2

2r600

22.8

21550

18.1

2rO2O

19.5

21180

20.9

2r34O

6;8

7 1960

LL.2

13,200

9.1

9,590

9.3

11ro0o

8.8

10r4O0

ó.5

70r500

L2.4

134,000

8.6

92,9OO

9.4

101,400

9.2

99r300

2t

I

ÎABLE 3

j

UEA¡I DIOItIELT I{ATIIRAL RIINOFF (ac.-fÈ')

Sub-BasUonth Graystoke Ffsb Bartk

UnreguletedBasf¡Belgo

Jantnry

February

Uarcb

Aprll

f4ay

June

July

Augnst

SepÈeober

October

Noueober

Decøber

A}TMTAL

26

26

27

316

41180

2r92O

158

79

79

27

26

26

7r890

7

7

E

94

L )2tû

E70

47

23

23

7

7

7

21340

L24

L24

L25

Lrl¿A

5r25O

2r800

260

100

r00

L25

L24

L24

10r400

11160

1r1óo

1r160

10r920

50r150

26r810

2,tßo

990

990

1r160

t,160

11160

99r300

)

ÎABLE 4 SIJMMARY OF ESTIMATES OF MINIMUU (TgZg.ST) ANNUAT RIJNOTF (fN,, AC..fÈ.)

L929 r930 1931Method Gray- Flsh Belgo Unreg. Gray- Ftsh Belgo Unreg. Gra¡ Ffeb Belg

stoke Hawk Basln stoke Hawk Basin Btoke Har¡k Baefn

I Stre+-€lon Data L2.4 11.4 4,7 4.9 11.5 LO,2 4.3 4.5 [0.8 9.6

4,160 L,240 5,540 52r900 3r860 1,140, 51070 49r600 3,630 11070 4r7LO 451300

2 0kanagan Inflow 13.6 12.1 5.1 5.3 Lz.g 11.5 4.8 5.1 12.0 LO.TD¿ta ' 4r5ro rr35; ó,010 57,200 41330 rr29o 51660 ssríoo 4ro3o rr2o0

3 U.B.G. Minfnu¡n L5.2 13.6 4.I 5.8 L4.6 13.1 4.0 5'5 L2.4 11.1Flq¡

5,1t0 1r510 41830 ó2r600 419I0 L1470 4r7LO 591400 41170 Lrztñ 41010 501800

AVERACE 13 .7 L2.3 ' , 4.6 5.3 13.0 11.6 4.4 5.0 I

,, , 4,600 11380 5,420 57 ,2OO 41370 I,300 51180 541900 3,

(

23

TABLE 5 UINIUT'U UOÌÛEI.Y RT'NOFF DISTRIBT,ÎION

(7. of January-Deceober, 1970)

ELgttATroN oqr.-uAR. apR, t{ay JINE JIIIï apR.-JrrLy a¡rc. sEp. apB.-sEp.

> 6500

6000-6500

5500-6000

s000-5500

4500-5000

4000-4500

3500-4000

3000-3500

2s00-3000

40 38

40 38

40 38

I+3 33.5

49 24

56 14.5

58 l058 t058 10

ó

ó

6

6.5

9.5

1l

11

11

11

11

ll11

L2

L2

L2

13

13

13

2

2

2

2

2

3

3

3

3

9t

91

91

90.5

87

95.5

85

85

85

1

III1.5

1.5

2

2

2

94

94

94

93.5

90,5

89

89

89

89

2

2

2

2

2

2

2

2

2

)

TABLE 6 DROUGHT PERIOD (rgzg-gr) uo¡nu¡.y l¡a1u8Al RtNoFF (ac.-ft.)

Gray-stoke

Uonth FtshHawk

FlghHawk

Belgo Unreg.Basln

Gray-aÈoke

Belgo Unreg.Basfnstoke Hawk

January

February

March

Aprll

lfay

June

July

Auguec

Septernber

October

Novenbor

,Deccober.._

15

15

16

Ls7

570

540

29

29

14

15

l5

t5

1r430 5r42O

L4 82

15 82

15 82

L52 622

550 21540

520 L r24O

28 104

28 104

L4 78

15 82

15 82

14 82

11380 5,180

905

906

906

6r850

27 r98O

13 ,7oo

I ,140

1r140

856

906

906

905 i

5?,1oo

47

48

48

532

I,94:

1 ,840

97

97

48

48

4B

47

4,840

87

87

88

.650

21650

1;300

108

108

81

87

.87l

,'l i 87':

957

957

958

7,250

29 1600

14,500

1r200

1,200

906

958

957

957

60r400

46

46

47

510

I ,860

1r760

93

93

46

47

46

46

41640

40

4L

4l

451

L )640

I,560

82

82

4L

41

4l

40

4r100

L2

13

l3

L34

490

460

24

24

L2

t3

13

l2

75

75

76

560

2r3LO

1 r130

94

94

7L

75

75

', 75

805

805

805

6r080

24r8¿û

L2rL7O

I,010

I,010

760

805

805

805

Lr220 4r7LO 5or7o0

25

I

TABIE 7 UEAII UONTETY I.AK8 EYAP(BAIAq|

Sub-BasfnGta stokeMonÈh Flsh Hask

fn. ' ac.-ft.Be.LFo

ln. EC.-ft.

JanuatT

February

Uarcb

Aprft

üay

June

July

August

SepÈeober

October

Noveober

Deceober

AI.INTIAL

0

0

0

L.29

3,01

3.50

4.64

4,L7

2.20

0.70

0

0

19.51

0

0

0

L.37

3.07

3.58

4.70

4.2L

2.25

o.74

0

0

19.91

0

0

0

I2T

24

32

29

15

5

0

o

135

0.01

0

0.09

1.9ó

3.66

4.26

5.27

4.6L

2.68

1.06

0.05

0.02

23.67

0

o

1

30

56

66

81

7L

4L

16

Io

3ó3

0

0

0

6

14

16

2L

19

10

3

0

0

-)

26

TABLE 8 UEAI{ UOIfTBLY NET INFtOtf (ac.-ft.)

llonth

Januar¡r

February

Uarcb

Aprll

lfay

Juoe

July

AugusÈ

Septe"tthcr

October

Novenber

Deceober

AìINTTAL

26

26

27

310

4rL66

2rg0/l-

137

60

69

24

26

26

71801

7

7

8

85

Lr2L9

846

15

-6

E

2

7

7

2r2O5

L24

L24

t24

Irl14

5r194

21734

L79

29

59

109

L23

L24

10r037

27

)

TABLE 9 DROttGïn PERIOD (1929;3f ) UONTELT Nm lNrtO[r (ac.ifÈ.)

L929 1930 1931Gray-stokc

FlshBask

Bè1go crçy-. Flsbstokc Ëar¡t,

Eelgo Gray- Flsb Belgo- sÈoke E¡ït

JanuatT

FebruetT

t¡rch

April

uay

Junc

July

Auguet

Septeober

OcÈober

Noveober

Deceobcr

A}INUAL

47

48

48

526

L1926

L1824

76

78

38

45

48

47

15 87 46

15 87 46

1ó 87 47

148 620 504

549 21594 1r846

516 L1234 LrTtA

-3 27 72

03774-l 40 36

10 7L 44

t5 86 46

15 87 46

'L4 82 40 L2 75

15 82 4L 13 75

15 81 4L 13 75

L43 592 445 L25 530

529 21484 t,626 469 21254

496 L,L74 LrStA 436 11064

-4 23 ó1 -8 13

-1 33 63 -5 23

-1 37 31 -3 30

10663885915 81 41 13 74

L4 82 40 L2 75

4r75L L,295 51057 4,551 L,245 4r8L7 41011 11085 4,347

M¡SSION'CREEK WATERSHED

KEY PLAN

#Fü

ffi'lìs-- "//

)Í

?fr.'-< r'ür-tlfÌ

:IHE*i'frlrjj

!I,a

IIIIit)

D

5tS

-l

'ËIe,a

!(,C'

l¡-l¡-ozfE

tszÞJlzz,

2500

r500

rooo

9.OO

800

700

600

)

r50

loor.523456789tO

ELEVATION lN FEET x IOOO

BRITISH COLUMBIADEPARTMENT OF IANDS, FORESTS, AND WATER RESOURCES

WATER RESOURCES SERVICEWATER INVESTIGATIONS BRANCH

TO ACCOMPANY REPORT ON

MISSIOT¡ CREEK WATER YIELO fOR ELACX I¡T}¡. t. D.

I97I ANNUAL UNIT RUNOFFMISSION CREEK EASIN

DAIE

auo.1972

D. REXSTEN --.._.-. ENG|NEER

HOR.___

rErr.36l0a.t1a

{)

)

.E

IC'I

I(,C'

l!l.LozfÉ.

l-

=Ð

J

Ðzz.

BRITISH COLUMBIAD€PARTMENT OF LANDS, FORESTS. AND WATER RESOURCES

WATER RESOURCES SERVICEWATER INVESTIGATIONS BRANCH

TO ACCOMPANY REPORf ON

IúISSION CREEI( WATEß YIELD FOR BLACK [TII. I . D.

ESTMATED MEAN ANNUAL UNIT RUNOFF

MISSION CREEK BASIN

DATE

auG, r972

P--,-.,!-F.-f.q.T-E N ENGINEII

HOR FILE No. FlG. No. .-..--- -9

rB I r -361{,a . w.Èf

32

)

COMPUT,ATION OF. STOR^ACE CONDITIONS .......

3. RESTIIj.TS OF STORAGE CALCUI,ATIONS .. O". " ' 37

t

DOTJI{SIR,EÁ}Í DEUAI{D1.

2.

)

covERNME*t y'tsH coLuMBtA ,4 Z'- 33EMORANDUM

APPE{DD( 1

EDA:mea

I.^elowna

llovenber 21 rc....?.?.

"u"¡r.t...!i.c-.ç-!r.Çp..d..li+iri-.l...115.e-...9n..Lo.::çrl'íission Creek

A study is currently under way by the ïtater hvestigationsBranch to determine the quantity of st,ora-ge water reouired by Black ì"lountainIrrigation District to meet its reo-uirements.. Tn connection with this studyf have been asked to co¡n¡nenù on r¡ater use at and belol+ the Srnithson AlphonseDagr on l''ission Creek. lfoul-d ¡rou olease folr.¡arti the folJ-ov¡Íng cor,unents to!fr..Reksten in the Hyrlrologr Ðivision

Ì"fy recorcl.s i¡clicate that the total liceneed ouantity onlfission Creek belovr the S¡nithson Alohonse Ða¡n is 4rO15 acre feet. This totaldoes not include i¡rcidenial Cornestic nor a laie priorit¡r li-cence held bythe Departnent of Recreation ancì Conservation for 4 cfs on fish ladders.Bl¿ck ilountaj¡ Ïrrigation Ðistrj.ctts ciiversion licences have a prioritydate of 1905. Irrigation licences authorizing a to'i;aI diversion of 3,356acre feet have a priority on Lower llission Creelc earlier thar¡ 1905. Licenceshave been g'ranted since 1905 on Lor.¡er ì'lission Creek authorizin.g the diversionof 659 acre feet.

' In order to satisfv the senior lieences on i.'rission Creeke:qoerience has shorvn'r;hat it is necessâIr'^r,o cì.ivert a flo.¡ of 17.8 cfs.(35.3 acre feet per ciar) at the Smithson Alphonse Darir thnoqhout the sr¡¡Ìrnerperd.od.

ou R Fr 1E...... ii]:.9-..........--....,

voui Fr 1E.... 9.T1.227-9...9i2!2

o.t-(-¿1t¿,

E.D. Ant ':,: P.ËnÊ. ,District Engineer.

ïours truly,

34

-f APPENDLX 2

COI{PTITAITOII OF SÎOBAGE CONDITIONS

An exanple of the nontbly cøputer accounÈl.ng procedure used to

obtaiu monthly storågc condltlons for Blaèk Mountafn Irrfgatlon DlstrfcÈ

fs sho¡¡n 1n Table 42.L. Althougb it ls a sfmple budgetlug procedure,

Èhe cæputer, of course, Eaves nany hours_ of tine over longband calcula-

tion.

A portlon of the basin runoff fa the basfn above the Blae.k Moun-

taln lrrfgatlon Dlstrfct lutake occurs ln the reseryoÍr dralnage basfns

as potentlal storage. By conslderlng tbe capacftfes of the fndlvldual

rese¡nrofrs, loss to lake evaporåÈfon, deoand, natural n¡noff ln Èhe area

belors the reser:volr baslns (but above Èbe lnÈake) and transmfsslon losses,

the totel a¡Eount of Írater stored at the end of each moath ls cøputed.

In order to clarlfy the procedure used to coopute tbese storåg€

condltlons, an erplanatfon ls gfven w1Èh reference to colrrrnn nuobere fa

lable 42.1.

Runoff for tbe wbole basln above the Black ldountaÍn lrrlgatfon

DfsÈrfcÈ fntake (1) consfsÈs of the runoff occurrfng fa the upstrean ra-

se¡¡rrolr dralnage baslas (2) ana the balance whlcb occurs belor¡ these bas-

lns (3). The naËurel (unregulated) tnflolr to each resenrofr 1s adJusted

for lake evaporattoa to glve nonthly neÈ lnfloss to each resen¡ofr (4 to

6). Considerfng the capacfty of the resepolrs, tbe nonËhly neÈ lnflou

) ls dfvlded lnÈo the portlon whfch can be stored untll tbe resenrolr ls

I35

flllad (7) (nfous a¡¡ounÈs are due to evaporatfon) aad that sbfch Eust ba

epflled cach moath frø eacb resenrolr (8). Thfs spill to the area beløthe rese¡rolr baslns eupplénents Èhe natural runoff belon tbe resewolr

basfns (3) and tbc total ls Èben Ghe aoouut of sater avalleble at tbe

Bl¡ck üouatafn lrrlgatlon DistrfcÈ dlveislon (9).' The Dontbly d+-'¡nd'

dete¡mines tbe eraounÈ actually dfvertcd (lO),

Durlng mtbe r¡hen avatlable eater exceeds deoand, sæe ursC be

spflled to ftanagan Lake (tt) tut laÈer ln tbe lrrlgatfon seesou, deo¡nd

e¡ceeds thê eater available aad r¡ater fa storege fs requtred (12). al-

lorsance nusÈ be made for ZtT tra¡a¡qlssfon losses fn Áuguet and Septeuber

(13) to glve the storege whlcb nust be releaeed (14). UoaÈh-end storagc

coadltloos (15) ere dctemlned by tbe accr¡uulated lnflqr stored by thc

rese¡r¡ofrs durfng tbe accr¡oulatloa perlod (7) an¿ the storage releaeed

durfng the depletfon perlod (14).

,)

ç-

t. ..- -srl¡t ,-"

\J

R u¡{ llF F tt E :ìf 1ì-

^8')V8 Vo ¡f.l uNrr{:G¡tll¡T)l IÀf^xÉ- ¡NFLCrt R(/NUFts

RES IìES RES fìES RESt23452 I OO ¡ 700 5470

JUL AI'G SEP2.5 l.O l.O

OoO OoO o.o o.o 2Q.O 20.O O.O

53.O J700 2.O t.O5.loo 37.O ?.O 1.050.5 27.O ?o5 ¡.O(7) (s) (e) (10) (rr)

o 7/¡l)2 I Jó 7J7ljO llfr39 37 tlóOU

?.)ro ^cRF-rr (rcÎ-r,^R

t îi3 'säl; riyâ'TRÁNSM¡ lSIOI.¡ LÍJSS

Nf\fN^T-RUÑOÊÉSERVO¡R (^CRE-FT)

(l) (2) (3)

?eO 4¡O'2.0 4oOTcO ll.O

(12) (r3) (14) (r5)f,IS RES RES TNfAL AVAIL N¡V SP¡II-L REOTDC, 7 8 I NFLO| SP¡I.L FOII RUN- TO! FEOU ltrANS SÍRG TOTILSTPD O ¡ VFI, S OFF . I.A'(Ê SIRr, LOSS USED ST RG

oo6t 507

I 7{1902 23403 I 0400(1) (5) (6)

l.Ol.Ol.O

ANNUÂ|- I ¡ 9()29 :¿00.29 992.)(,, l$00 2204 I OO.ts

ó501 40ao 53q71 3720 5025r

-35'4--6-¡-f 1---al19rfr--4Tû9--7At

o 3 10 2Dr,3 ^470-5 93 ¡OBó ô¡OO

5 t34 lt27 tôôo927l) tO770 lloo70 taooJ 9(1999 C9f,2

o.""¡606o 30¡f,o 312

7 34?3120f,.¡ 3

ooo905o o o 20¡Jo o o 8a¡s

ln27361 ó

.f t 2

5656

.r2t6l)2

o

92J

ÎABLE A2.1 EXAUPLE OF SÎORAGE C4LCT¡I.AIIONS

" t¡,(ñ

37tIiiÌ

v.)

RESIILTS Of ISTORAGE CALCUI"ATIONS

oaaaaoaoaaaaaararaaaaarao.aoaaaa aJ a a a a

a a a t a a a a a t a a a a a a a a a r o a a a o , a a a t a a a a a a a a

RI'N 1

RI¡N 2

Page

38

43

)

f{uxaER Ot

STORAGEAR€A CAPACI rY( ACREST ( AcR€-Ft t OCT-rAR I{AY JUNI 2OO¡ O2 E¡.3I lBa.O

1 Graystoke Reservoir

60000 0I 700. o517Oo O

loO0Jr lOt¡7O

Oe 7OOoTOI ¡2O

I ol0lr¡lO210 O

lo5Olo6O -¡}o3O

ÔoóO', ¡lo2o 2o2O20 ?.oóO 2c

20?o

loTO l.SrJO lr

a_E!eb_Ub!tr_ I e se¡yq_lr3 Belgo Reservoi¡it

1ò

APF llAV . :' JUNI I rO 5Ooã 27¡O.

O¡O

i rtAilNUAL ÌaAl Rt {OFl AEOVE lilfArl ¡ tlggtO ACRE-FÍ

TRANSI|!SStON LOSS

RESÊRYOIR 'ACRE-FÎ

I7A9023ôOó150

OCT-llAR7r0O.O

I23

R€S R€S FES NES.õ6t

5¡.O33¡O -

5Oo5

Res Îf¡fÂ-.,-,ì AVAIL DtYO TNFLOT SPILL FOR 'RUN.

STRD DI VEl S OFF

SPILL REO'O ' !

fo FRo¡r fFANs sf:tc ToYtLLAKE STRG. ,LOSS US€O SÍNG

o o o' 6t.oootó60o o o lot6tt9?8. .I9ó 2l7r tO79ttaaó 7tt arot ó4,l?¡t2ô 223 trst |trat

2oO2rO '?¡O

¡l rO--'¡loOIt¡O

NUN(FF RESEN-âBOY€ VOIR UT{REG

xrNfH. _ I Nf AfE ..1I{FLO|_-RUXOFF _-

8395 óa9 t?1613¡92 ttoS 12045ó05ó5 ecfl9 6t 93ó

RES RES RESt23

óooo_ . t?oo _._6170ta6 a2 a2l5294 Ar] ó66

rlf2 l2¡9 lt50OCT-TAN

APRxAv

ór¡ o "t7.6..-ro,'-'irsr'I ()r¡6 0 12085 5r r 203 ¡a50l o 5t93ó 252f¡ agal IJut{-.¡?jñ¡ôôol-.?'tôl_at¡-ló¡l9ooF-.J*æo"?-3-t.5|?-'¡|JUL ?.196 J(¡.t zûl1 8l l5 ll I 0 .11,3, ?ltoB a7s¡tAUG I teg lôó lof¡ 9 -a -6 -t t g lOô? .óPasEP ¡ le9 16ó lo3t a2 A 22 12 . . 6t -. t Oea ' 22?-O

oo0

ANilUAL t¡9929 tós8t 1033a9 75ó5 2205 698ó t f,t tt,5l at

2ÉO5 t0s9ra l87lô 9J90ô óóeo ¡J¡c 6021

CANRY.OYEß SIORAGE l73l aaz 2eó8a.a'r tta.t. t.r ata a.0ataar.t. rata.ra+atttartatratlalta ttattttrttttaataattaaatart.trtatta rraarttarra t ttattftlttttlrtlataa

I

.t

,a-ft

Alllu L }ll¡ nUilOFF AOOVE tllflfE r óta90 ACRE-FÍ

rnANSrlSS¡oN LOSS

GSeRVO! n

I2 '---5

IACRE-FT 'aóOO ó.O- lJ6O -'.'"--:---'--'-- ó¡03ôóO 9r5

I I .O tO.O 3â¡O'- -l I ¡O - - ¡lO¡ O -"-' 3Ar O- .--t2oO a9.0 2OoO

?co 2.O. loO2oO--'-' 2¡O'-'-- lrO*2rO ' ZcQ 1.5

a ?2t a32ó 9A

RUN(FF NESER.AEOVE vo tR

RES RES RES3

5470

3to305

t ó39

^noYE vo IR u¡¡REc I 2r{lNfH tNrAxE lÀFLOr RUN¡¡FF ' ôOOO rtoo

ocï-ltA¡ 650? f,At 5A 19 2óa 7afPq a2r9 lo73 7rôó aóa ¡.2¡AY 33560 ao87 29atr r?90 53¡IE'lrJt|--311t--1t-ts:¡-tú9û-€r3?o r89 ¡t8r t5JULAUGs€P

t370 la9 l¡8t 22to27 ¡ r2 916 9-3 -ttooo lt

020to a 62A

22?O

36f'53aa?t 296

tSat3ttó

ooo

r ¡ 8tltate?.

ooa 689 . al 3óese I 5s5

AíilUAL óE{9 ¡ 9"0 69O5t , a27a ¡zr8 tq9,8 iCARRY-OVER SlORAGE 105? 2ro toto

""' tt"' t'1"" r"t'}t,ltltt¡ts¡llt.tt lrr at at'tata ttat ttttttt ataiçrrrte rrrtrtttt.rtaatrta at rat ataraar.¡t at aratttaa.r ta.aartr

Eott ô0a 696st ts7¡ó ag28ó GItt tó69 toolT3t3ó 1 ", :-

IIAY.. JUN¡l9¡O . j 24.OOoO OoO ào.o 2oro. 2O¡ O

aO.O !8.O 2.O. ?.cO l.Ol0oO--'B8¡O--:--'- 2cO'- "' 2.O ---'-t.O'a9.O 2+.O 2.O 2cO 1.5

1.. .., , .. i ,.:. r:.;. . ''JtL , AuG .SEP .. :', , .,.' r.. ";2co 2ro ' "ì t.5'.' , ' . '. '"' i. ' l.' "'' ANNUI- NAf RltlOFF IBOVE INTAXE ' ôata0 AcRÉ-FfÌRANSrltSS¡ON LOSS

., RESERV OI R ACRE-FT I

OCT-IIAR APR9o5 t 2oO

-l '--'-'23

O¡O OoO

3220 r 9¡5 l2o0

R€S RES RES RÉS6

7t 2a7t 33 35óae9 l52t

RUI{GF RESER-ABOVE VOIR

IONTH... I ilrArE l t\FLOI

ocÍ-lr^R 'órso óaóAPR 7769 lOtOra^Y 3t72J 3A¡ó

UI{REGRUNOFF

550aó759

2?A77

RESt

óooo

251¿¡59

I ó98

REO' DFROHsrR6

TRANSLOSS

RÉsó' RES RESTA

TOTA-'¡NTLOf .SPILL

STRO

AVAILFOR

o¡vERs

'tlv sPtLLRUN- fOOFF LAKE

SVNG IOTALUSEO SfRG

ótl918 ..t

37t A

ooo

ooo

16ó9 73a . aro3 ó77a35t L02 a?ta '257!135¡1 271 ¡ 625 961

5504 I 0t67s9 5a27477 25".5

.53tt6705

25352

a5óó8 A53a

oooooo37f8469ó8ala

JULAUGSEP

1295 l7A tttT- t¡ -51295 t7A97t tos ô6ó

tlrT tt -27 -l-16-5

7-¡l I

t280ó6.

9óto 55850

,47a6aô2a2220

-¡l,a7t 6\

p r r l?o trlTc aóó

ooo

ANNUAL 6a7¡t¡ a890 5s850 aoas ¡ ¡ ó7 2857I ll I /r( I

GARRY-OVER STOR^GE 32a a3 ssa

|"I

1707 t02at

tt aa ataaaa aa at tt t t tttattata+at ta tatt ttta latttlttftttltatl tt altttttttattat tr¡aaattrtlttttttttttttatrtrtttttlattt atttta tt

-r,1-------

ANNUAL I{A1 RI¡IOFF. ABOYE tillAxE ¡ 50aao ACRE-FÍ¡rcÎ-NAR APR9¡5 l2oO

HAV ,. Jt,NO9rO. ?¡}.O

ö. à.'-,.': o. o

JUL AT'G s€Plr3

ooo ooo__'_?_.9, þo.o

?cOTRAilS,lISStON LOSS

RESERVOI R ACRE-Ff I

20oO 20 oO

ó. O I ! .9 aO.O 3O.O 2oO 2.O .' I oO-óoO'--Il.O -- to¡o ---38¡O 1-.--..2.O----- 2¡O--=.,.1 iO9¡5 l2oo ¿]9oo 2¡loo " 2cO ZoO lo3

RES RES IOÍAL7 a ¡NFLOT. SIRD

I23

3920I loo29AO

RUNTTF RESER. RES RÉS RES RESAAOVEYOIRUNREGt2SaINTAXE tÀFt-Ot RUNoFF óOOO ¡700 5.70

RES NES5ó ' AVATL

SPTLL FORD I vEts

REO' OfiRoL.STRGlloNrll

OCT-¡AFAPRTAY

5ó5t 5a97138 9t929¡ a5 3500

50ó ¡ó219

25645224 66alo t20tsta a5¡

lo28 a7A6 0 375A 75,2 aSto 371 ¡¡oza aó28 0 .3óOO t20 1326t -ótó796 _--.2220 ,,___ .. O . la2a _-__-zas - ¡70ô, i?3.2_-r

s¡3ee_H$IIQ ar.ó5 .67a? ¡757 to538

I23

Qo?O l rJo t; Oo t.50 t¡ 609.?9 !.!q 3¡to 3:óõ, r;tõ_t ¡ 2 o___2o,_go.___._9. Ig.._-__-1..-f Q_-_-_s ;3 o

222

fo20I o2O| ¡5O

r?0c?-O.l.o

li. '

il

\.

TR^ilSr{¡ SSt ON LOSS

RESERVo¡R I ACRE-FTl

I23

Þ^J¡ N S{U55FUNÍJFF FES€R- RES RFS RFSAOOVE VOIR UI.¡REG I 2 3

xoNfH INTAxE INFLOT RUNOFF aOOO t?OO 5a70

7890 ? oO ¡l .O 53. O_ 23ô O i_.-,2¡ O ___.ô

¡ O._l : 53. O -;.IO4OO' ?oO 'll¡O 5O.5

37; O 2.O'37 oO ' '- ? ¡O ì-.-:'27c O 2.5

FESa

RE95

RESô

3RF, Re s ïotALA INFLOI sPI LL

STND- '-a -.- -

AVAlL',.. frlv sPILL REO.DFOR RUN- YO FROrl

DtvERS,__.qFr. , L^KE _.-Sf RGÎRAN3 SÍBG,fO'AL.

. -fôCs--.usFq -.5iri6- 'OCT-xlR 8:195 9ll 7a6? t a9 1?. ?¡0ADn trtt? l55r l¡óf,f, ?.tî, at lllllaAY rtosó5 l0f¡7t ¿tottr¡l 4t4l- Itto t¡to5-laAY rtosó5 l0f¡7t ¿tottr¡l 4t4l- Itto t¡t

f, uN-: ?:rð l- õ 59 f-?578 8-2 876-ft4 l-27= JUN-:?:rð l- õ59f-?5788-2 876-ft4 l-27{JUL 2996 465 2-534 I OO t5 ¡79AUG t t99 206s€P t¡ç9 206

AI{NUAL ,l 19929 20630 99300 ?6ô5 220s t OO35 \'l'L tl¡?2. 87¡6 tOBO!6 t87tó 95eal óóa5 1329 l,f?ARR

a i r. . a.r tr t t a a a a r t rl a tr a r r tr a t t t rr at a i tt a a a tl a at att I t a a lrt tt i a t at at lttat t a t t tt '} r ra rt t at at ta tr r a t a tt tl a a t t a a rr a a a trt t r taaa

993 ?6 -a 3! {f; ó.o t O5.l ô6?8 , . 0 : 3576 715 a29O 4525egf,.. 5¡.. _. 6 ó3,

.'.)'

_ - ___^¡f!.u^L-_-1.À!__8.rr.!!_o!:!:_ÀQot.E*..¡f!r-tÍ_E_:_-O_Q_19!_ lÇRF_:F_I

TRANSITI SSTON LOSS

RE SERVOI R I ACR;-Frt

rô. i¡_--._ ?¡;ti_ ._ _ãiõ_,_ e:õ_ i:;.... _ _j___r._i_- =--.',, i

oct-tr^R APPl2¡ O

OoO

9.5O¡O OoO OoO 2O¡O . -'2OrO

2Oo O

6.O lloo ao.o'-6o0 -t I ¡O' aO;O8ol l2.O tó.9

¡8.O' ?oOtD.o, 2¡î.27tlt . ?.O

2.O l. O2.O I ¡O?rO I ol

otv sPtLLRUN. YO,OFF LAXE

REO'OFfiorl , TR^NSSTRG.- LDSS

49t32 aeó? ¡tsa . Ð920^I{NUAL ó8ô9¡ t I f,90 ' 57 t00 a3s7 t 2aa 50ô6 7969 2680 3e76t t07tó

GARflI-OVÉR SfORlcE 0 60t OOó r r.. ,, ,,

':t'l" t'tt"tl taa tt +.tt.t+atatr.t*talr t tttt at.t atrrrttltatrart rtr rtrraartta+trlrtrr.a t..rtrr.r *ar Il.r. rttatr.ràt. tllat.!

sr¡

I

RESERVOtn I ACRE-Fft

--l_ t37O (t.0" 2-' -- I3oo---------t-'6;õ3 5t70 8..

Rt,NOFF RESER.ABovE vo¡RlilTAxE lttFLOr

I I oO

-l i.Ol2oO

- lo.o .380(' 2¡O---¡lO.O-'--- 38.O' -'-'2oO---46.9 .a!., 2.O

TOXlH

oc T-r{ tRAPR

JULAUGSEP

^t'INUAL

DtvRUN.

" oFlt9t5a

SÏRG., usEo

o,o

ror ALsTR6

l9a66tso7769

I 295¡ 29597¡

óa74 IcARn

77a244

SPILL RFO'O¡O FROX ÎRANS

LAKE.. STRG LOSS

5ta5 0 0ó471 O O 3t 7a

223f26

4 80ó

525.tr.. aaatrt.r ttt rùrtraarr+ra attrrrrttatrar ttrttatt itttttttt+atttüttrt ttttttat t+rtartttta,tar.rtttat ttttrta a.rdStattr.ta

IIa

217 loTa 30 -s2 t7 to76 f,s -2t2+.-...- a47. - rQ__-- :!t08ro 53900 ôt25 tt67

t6 .f,o rto825 tt tlt9-¡---*le.-:- OAq

99t 7 , I O¡ " ,5¡ro8t 187¡6 a3aa3 ast I lToa I o22e

I

3 47tO

IOTAL . AVAIL ,OIV SPILL REOIDINFLOI SPILL FOR RUN- .ÍO FROI{ T¡ANS___$fRD -_--_. :._- 9tvERs ----oFF .. LAf E- ----$fRG--l".oss----

RES NES. 'FES 'RFSo567

RE3a

FUNOFF R€S€R. RES RES RESABOVE VOIR UNREG I 2 3

IIONTH INTAKE INFLOT RUNOFF 'OOO

ITOO 5¿I7O

ocT-{^R 5651 702 .949 ?26, 6ó 377APR 7t f6 tt26 60t I 415 120 535raAv 29ta5 4249 2449ó t5

-J¡ii¡-Tfz7ffi

a960

2qa

t9It

ooo

70703a

6oI

4

t9t54

99J q7A6993 aó2478rJ'_?220

¡ a7ró

a75A O5957 (l

SÍRG ÌfIfALUSEO STRG

o t607o 2677o.o

JUL rtgo t96 , 993 ?,t -T t3 26 , '. OAUG lt90 t96 993 26 -1 ?a ' 15 0sEf' 692 tlz __.-- 780._. . l2 __-__ -2 ._ 2O___._

^r{NuAL 69{A1 98tO r96bd 367ó : tO¡O 43a6

ii

o 37q3 759 055t0 3ó35 727 at62

_--. - .._o._.. lf+o.----268 --172a --3eä2t aaóa l?7r l06.¡eo6t o +96ó9

I

¿8

REFERENCBS

:

;

l. tEAGSr-1. A. J., trOkånagan Basia Inflor Detemlnatlonstt, [¡ater lwc¡-

itgattons Branch, Septeúcr, 197p, B. C. WaÈer Rc-

' gourggg Se¡nrtcc.

2. OBEDKOFf, W., rtÀppllcatfon of tbe Grld Square üethod for EsÈlmatlng

Okanagan Sub-Baslq nunoffn¡ Deeeober, Lg7L- B. G.

IJater Resources SerrÍcs.

ItAverage Flows ln the üal¡ Trfbutsry Dasl.asrr, Uarcb,

L972, Uolversfty of BrfÈÍsb Coh@bfa.

4. BEKSÎEN, D. E., rllanbly 6teek lüaÈer Ylald for Lakevlen lrrlgatfon

Dl.strlcÈtt, Deceober, 1970, Ileter lavestlgatloag

Branch.

¡lFlows la tbe Uain lrlbuÈery Basfnsrr, February, L972,

Unlversfty of Brftfsh Gohnbl¡.

3.

5.

)